Stability and Failure of the Edge-Closed Honeycomb Sandwich Panels with Face/Core Debonding
Stability and Failure of the Edge-Closed Honeycomb Sandwich Panels with Face/Core Debonding
复制标题
面/芯脱粘封边蜂窝夹芯板的稳定性和失效
DOI：
10.3390/app10217457
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Fanyun Liu
中科院分区：
文献类型：
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作者：
B. Yan;Xinfeng Wang;Song Pan;Mingbo Tong;Jian Yu;Fanyun Liu
采用实验和数值模拟的方法研究了具有面芯脱粘的边缘封闭蜂窝夹层结构在压缩载荷作用下的力学性能。对碳/环氧面板与蜂窝芯材之间不同脱粘尺寸的非对称夹层结构进行了单轴压缩试验。试验结果表明，脱粘试件的破坏主要是由脱粘区面板的局部屈曲引起的。随着脱粘尺寸的增大，夹层结构的破坏区域逐渐从边缘封闭的斜面区域向脱粘区域转移，同时夹层结构的稳定性和承载能力呈下降趋势。与无损试件相比，两种缺陷试件的剩余强度分别下降了9.9%和22.1%。基于线性屈曲理论和连续损伤力学的数值模型的模拟结果与实验数据吻合较好。研究结果对评估具有面芯剥离的封边蜂窝夹芯板的损伤容限具有指导意义。
This study investigated the mechanical performance of the edge-closed honeycomb sandwich structure with face/core debonding under compressive load by experimental and numerical methods. Uniaxial compression tests of asymmetric sandwich structures with various debonding sizes between the carbon/epoxy face sheets and the honeycomb core were conducted. The experimental results showed that the failure of debonding specimens was mainly caused by the local buckling of face sheets at the debonding area. The failure zone of sandwich structures gradually translated from the edge-closed beveled area to the debonding area with the increase of debonding sizes correspondingly, Meanwhile, the stability and the load carrying capacity of sandwich structures were in a downtrend. Compared with the nondestructive specimens, the residual strength of two kinds of defective specimens decreased by 9.9% and 22.1%, respectively. The simulation of the developed numerical model based on the linear buckling theory and the continuum damage mechanics agreed well with the experimental data. The study has guide to assess on the damage tolerance of edge-closed honeycomb sandwich panels with face/core debonding.